3.5.1 Simple and Facilitated Diffusion Flashcards

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1
Q

diffusion

A
  • the tendency for particles to move from an area of high concentration to an area of low concentration. The rate of diffusion depends on four main factors:
    1. The concentration gradient—the relative density of a chemical substance
    2. The temperature—molecules move faster at higher temperatures
    3. The charge—the net positive or negative charge on a molecule
    4. The diameter of the molecule—the width of a molecule
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2
Q

facilitated diffusion

A
  • applies to the movement of molecules across biological membranes and down a concentration gradient with the aid of special transport proteins located in the cell membrane
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3
Q

Which of the following are not molecules that can facilitate passive diffusion?

A
  • ATP regulated enzymes
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4
Q

After placing Paramecium into a salt solution, you would expect that

A
  • the cell will expend energy to move sodium out of the cell
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5
Q

Which of the following is not a determinant of the speed of diffusion?

A
  • Shape
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6
Q

Which of the following statements concerning diffusion is not true?

A
  • Diffusion is an energy-dependent process.
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7
Q

Which of the following answers includes all of the other terms on the list?

A
  • passive transport
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